The largest 4-digit prime which remains prime when 2 is added to any of its digits. I.e., 8761, 6961, 6781, and 6763 are primes. [Opao]
Regal Entertainment Group operates the largest and most geographically diverse theatre circuit in the United States, consisting of 6761 screens (as of July 29, 2010).
The largest prime concatenated in descending order from two consecutive double-digit primes. [Loungrides]
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